Cell membrane transport

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VERY Low conc. of water molecules. High water potential.

Sugar molecule

DILUTE SOLUTION

CONCENTRATED SOLUTION

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Osmosis

Cell membrane partially permeable.

Inside cell

Outside cell

High conc. of water molecules. High water potential.

Low conc. of water molecules. High water potential.

OSMOSIS

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Osmosis

Cell membrane partially permeable.

Inside cell

Outside cell

OSMOSIS

EQUILIBRIUM. Equal water concentration on each side. Equal water potential has been reached. There is no net movement of water

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Exocytosis

The opposite of endocytosis is exocytosis. Large molecules that are manufactured in the cell are released through the cell membrane.

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Endocytosis is the case when a molecule causes the cell membrane to bulge inward, forming a vesicle. Phagocytosis is the type of endocytosis where an entire cell is engulfed. Pinocytosis is when the external fluid is engulfed. Receptor-mediated endocytosis occurs when the material to be transported binds to certain specific molecules in the membrane. Examples include the transport of insulin and cholesterol into animal cells.

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